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freebsd-skq/sys/rpc/clnt_vc.c

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/* $NetBSD: clnt_vc.c,v 1.4 2000/07/14 08:40:42 fvdl Exp $ */
/*
* Sun RPC is a product of Sun Microsystems, Inc. and is provided for
* unrestricted use provided that this legend is included on all tape
* media and as a part of the software program in whole or part. Users
* may copy or modify Sun RPC without charge, but are not authorized
* to license or distribute it to anyone else except as part of a product or
* program developed by the user.
*
* SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
* WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
* PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
*
* Sun RPC is provided with no support and without any obligation on the
* part of Sun Microsystems, Inc. to assist in its use, correction,
* modification or enhancement.
*
* SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
* INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
* OR ANY PART THEREOF.
*
* In no event will Sun Microsystems, Inc. be liable for any lost revenue
* or profits or other special, indirect and consequential damages, even if
* Sun has been advised of the possibility of such damages.
*
* Sun Microsystems, Inc.
* 2550 Garcia Avenue
* Mountain View, California 94043
*/
#if defined(LIBC_SCCS) && !defined(lint)
static char *sccsid2 = "@(#)clnt_tcp.c 1.37 87/10/05 Copyr 1984 Sun Micro";
static char *sccsid = "@(#)clnt_tcp.c 2.2 88/08/01 4.0 RPCSRC";
static char sccsid3[] = "@(#)clnt_vc.c 1.19 89/03/16 Copyr 1988 Sun Micro";
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*
* clnt_tcp.c, Implements a TCP/IP based, client side RPC.
*
* Copyright (C) 1984, Sun Microsystems, Inc.
*
* TCP based RPC supports 'batched calls'.
* A sequence of calls may be batched-up in a send buffer. The rpc call
* return immediately to the client even though the call was not necessarily
* sent. The batching occurs if the results' xdr routine is NULL (0) AND
* the rpc timeout value is zero (see clnt.h, rpc).
*
* Clients should NOT casually batch calls that in fact return results; that is,
* the server side should be aware that a call is batched and not produce any
* return message. Batched calls that produce many result messages can
* deadlock (netlock) the client and the server....
*
* Now go hang yourself.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/mutex.h>
#include <sys/pcpu.h>
#include <sys/proc.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/syslog.h>
#include <sys/time.h>
#include <sys/uio.h>
#include <rpc/rpc.h>
#include <rpc/rpc_com.h>
#define MCALL_MSG_SIZE 24
struct cmessage {
struct cmsghdr cmsg;
struct cmsgcred cmcred;
};
static enum clnt_stat clnt_vc_call(CLIENT *, rpcproc_t, xdrproc_t, void *,
xdrproc_t, void *, struct timeval);
static void clnt_vc_geterr(CLIENT *, struct rpc_err *);
static bool_t clnt_vc_freeres(CLIENT *, xdrproc_t, void *);
static void clnt_vc_abort(CLIENT *);
static bool_t clnt_vc_control(CLIENT *, u_int, void *);
static void clnt_vc_destroy(CLIENT *);
static bool_t time_not_ok(struct timeval *);
static void clnt_vc_soupcall(struct socket *so, void *arg, int waitflag);
static struct clnt_ops clnt_vc_ops = {
.cl_call = clnt_vc_call,
.cl_abort = clnt_vc_abort,
.cl_geterr = clnt_vc_geterr,
.cl_freeres = clnt_vc_freeres,
.cl_destroy = clnt_vc_destroy,
.cl_control = clnt_vc_control
};
/*
* A pending RPC request which awaits a reply.
*/
struct ct_request {
TAILQ_ENTRY(ct_request) cr_link;
uint32_t cr_xid; /* XID of request */
struct mbuf *cr_mrep; /* reply received by upcall */
int cr_error; /* any error from upcall */
};
TAILQ_HEAD(ct_request_list, ct_request);
struct ct_data {
struct mtx ct_lock;
struct socket *ct_socket; /* connection socket */
bool_t ct_closeit; /* close it on destroy */
struct timeval ct_wait; /* wait interval in milliseconds */
struct sockaddr_storage ct_addr; /* remote addr */
struct rpc_err ct_error;
uint32_t ct_xid;
char ct_mcallc[MCALL_MSG_SIZE]; /* marshalled callmsg */
size_t ct_mpos; /* pos after marshal */
const char *ct_waitchan;
int ct_waitflag;
struct mbuf *ct_record; /* current reply record */
size_t ct_record_resid; /* how much left of reply to read */
bool_t ct_record_eor; /* true if reading last fragment */
struct ct_request_list ct_pending;
};
static const char clnt_vc_errstr[] = "%s : %s";
static const char clnt_vc_str[] = "clnt_vc_create";
static const char clnt_read_vc_str[] = "read_vc";
static const char __no_mem_str[] = "out of memory";
/*
* Create a client handle for a connection.
* Default options are set, which the user can change using clnt_control()'s.
* The rpc/vc package does buffering similar to stdio, so the client
* must pick send and receive buffer sizes, 0 => use the default.
* NB: fd is copied into a private area.
* NB: The rpch->cl_auth is set null authentication. Caller may wish to
* set this something more useful.
*
* fd should be an open socket
*/
CLIENT *
clnt_vc_create(
struct socket *so, /* open file descriptor */
struct sockaddr *raddr, /* servers address */
const rpcprog_t prog, /* program number */
const rpcvers_t vers, /* version number */
size_t sendsz, /* buffer recv size */
size_t recvsz) /* buffer send size */
{
CLIENT *cl; /* client handle */
struct ct_data *ct = NULL; /* client handle */
struct timeval now;
struct rpc_msg call_msg;
static uint32_t disrupt;
struct __rpc_sockinfo si;
XDR xdrs;
int error;
if (disrupt == 0)
disrupt = (uint32_t)(long)raddr;
cl = (CLIENT *)mem_alloc(sizeof (*cl));
ct = (struct ct_data *)mem_alloc(sizeof (*ct));
mtx_init(&ct->ct_lock, "ct->ct_lock", NULL, MTX_DEF);
if ((so->so_state & (SS_ISCONNECTED|SS_ISCONFIRMING)) == 0) {
error = soconnect(so, raddr, curthread);
if (error) {
rpc_createerr.cf_stat = RPC_SYSTEMERROR;
rpc_createerr.cf_error.re_errno = error;
goto err;
}
}
if (!__rpc_socket2sockinfo(so, &si))
goto err;
ct->ct_closeit = FALSE;
/*
* Set up private data struct
*/
ct->ct_socket = so;
ct->ct_wait.tv_sec = -1;
ct->ct_wait.tv_usec = -1;
memcpy(&ct->ct_addr, raddr, raddr->sa_len);
/*
* Initialize call message
*/
getmicrotime(&now);
ct->ct_xid = ((uint32_t)++disrupt) ^ __RPC_GETXID(&now);
call_msg.rm_xid = ct->ct_xid;
call_msg.rm_direction = CALL;
call_msg.rm_call.cb_rpcvers = RPC_MSG_VERSION;
call_msg.rm_call.cb_prog = (uint32_t)prog;
call_msg.rm_call.cb_vers = (uint32_t)vers;
/*
* pre-serialize the static part of the call msg and stash it away
*/
xdrmem_create(&xdrs, ct->ct_mcallc, MCALL_MSG_SIZE,
XDR_ENCODE);
if (! xdr_callhdr(&xdrs, &call_msg)) {
if (ct->ct_closeit) {
soclose(ct->ct_socket);
}
goto err;
}
ct->ct_mpos = XDR_GETPOS(&xdrs);
XDR_DESTROY(&xdrs);
ct->ct_waitchan = "rpcrecv";
ct->ct_waitflag = 0;
/*
* Create a client handle which uses xdrrec for serialization
* and authnone for authentication.
*/
cl->cl_ops = &clnt_vc_ops;
cl->cl_private = ct;
cl->cl_auth = authnone_create();
sendsz = __rpc_get_t_size(si.si_af, si.si_proto, (int)sendsz);
recvsz = __rpc_get_t_size(si.si_af, si.si_proto, (int)recvsz);
SOCKBUF_LOCK(&ct->ct_socket->so_rcv);
ct->ct_socket->so_upcallarg = ct;
ct->ct_socket->so_upcall = clnt_vc_soupcall;
ct->ct_socket->so_rcv.sb_flags |= SB_UPCALL;
SOCKBUF_UNLOCK(&ct->ct_socket->so_rcv);
ct->ct_record = NULL;
ct->ct_record_resid = 0;
TAILQ_INIT(&ct->ct_pending);
return (cl);
err:
if (cl) {
if (ct) {
mem_free(ct, sizeof (struct ct_data));
}
if (cl)
mem_free(cl, sizeof (CLIENT));
}
return ((CLIENT *)NULL);
}
static enum clnt_stat
clnt_vc_call(
CLIENT *cl,
rpcproc_t proc,
xdrproc_t xdr_args,
void *args_ptr,
xdrproc_t xdr_results,
void *results_ptr,
struct timeval utimeout)
{
struct ct_data *ct = (struct ct_data *) cl->cl_private;
XDR xdrs;
struct rpc_msg reply_msg;
bool_t ok;
int nrefreshes = 2; /* number of times to refresh cred */
struct timeval timeout;
uint32_t xid;
struct mbuf *mreq = NULL;
struct ct_request cr;
int error;
mtx_lock(&ct->ct_lock);
cr.cr_mrep = NULL;
cr.cr_error = 0;
if (ct->ct_wait.tv_usec == -1) {
timeout = utimeout; /* use supplied timeout */
} else {
timeout = ct->ct_wait; /* use default timeout */
}
call_again:
mtx_assert(&ct->ct_lock, MA_OWNED);
ct->ct_xid++;
xid = ct->ct_xid;
mtx_unlock(&ct->ct_lock);
/*
* Leave space to pre-pend the record mark.
*/
MGETHDR(mreq, M_WAIT, MT_DATA);
MCLGET(mreq, M_WAIT);
mreq->m_len = 0;
mreq->m_data += sizeof(uint32_t);
m_append(mreq, ct->ct_mpos, ct->ct_mcallc);
/*
* The XID is the first thing in the request.
*/
*mtod(mreq, uint32_t *) = htonl(xid);
xdrmbuf_create(&xdrs, mreq, XDR_ENCODE);
ct->ct_error.re_status = RPC_SUCCESS;
if ((! XDR_PUTINT32(&xdrs, &proc)) ||
(! AUTH_MARSHALL(cl->cl_auth, &xdrs)) ||
(! (*xdr_args)(&xdrs, args_ptr))) {
if (ct->ct_error.re_status == RPC_SUCCESS)
ct->ct_error.re_status = RPC_CANTENCODEARGS;
m_freem(mreq);
return (ct->ct_error.re_status);
}
m_fixhdr(mreq);
/*
* Prepend a record marker containing the packet length.
*/
M_PREPEND(mreq, sizeof(uint32_t), M_WAIT);
*mtod(mreq, uint32_t *) =
htonl(0x80000000 | (mreq->m_pkthdr.len - sizeof(uint32_t)));
cr.cr_xid = xid;
mtx_lock(&ct->ct_lock);
TAILQ_INSERT_TAIL(&ct->ct_pending, &cr, cr_link);
mtx_unlock(&ct->ct_lock);
/*
* sosend consumes mreq.
*/
error = sosend(ct->ct_socket, NULL, NULL, mreq, NULL, 0, curthread);
mreq = NULL;
reply_msg.acpted_rply.ar_verf = _null_auth;
reply_msg.acpted_rply.ar_results.where = results_ptr;
reply_msg.acpted_rply.ar_results.proc = xdr_results;
mtx_lock(&ct->ct_lock);
if (error) {
TAILQ_REMOVE(&ct->ct_pending, &cr, cr_link);
ct->ct_error.re_errno = error;
ct->ct_error.re_status = RPC_CANTSEND;
goto out;
}
/*
* Check to see if we got an upcall while waiting for the
* lock. In both these cases, the request has been removed
* from ct->ct_pending.
*/
if (cr.cr_error) {
ct->ct_error.re_errno = cr.cr_error;
ct->ct_error.re_status = RPC_CANTRECV;
goto out;
}
if (cr.cr_mrep) {
goto got_reply;
}
/*
* Hack to provide rpc-based message passing
*/
if (timeout.tv_sec == 0 && timeout.tv_usec == 0) {
if (cr.cr_xid)
TAILQ_REMOVE(&ct->ct_pending, &cr, cr_link);
ct->ct_error.re_status = RPC_TIMEDOUT;
goto out;
}
error = msleep(&cr, &ct->ct_lock, ct->ct_waitflag, ct->ct_waitchan,
tvtohz(&timeout));
if (error) {
/*
* The sleep returned an error so our request is still
* on the list. Turn the error code into an
* appropriate client status.
*/
if (cr.cr_xid)
TAILQ_REMOVE(&ct->ct_pending, &cr, cr_link);
ct->ct_error.re_errno = error;
switch (error) {
case EINTR:
ct->ct_error.re_status = RPC_INTR;
break;
case EWOULDBLOCK:
ct->ct_error.re_status = RPC_TIMEDOUT;
break;
default:
ct->ct_error.re_status = RPC_CANTRECV;
}
goto out;
} else {
/*
* We were woken up by the upcall. If the
* upcall had a receive error, report that,
* otherwise we have a reply.
*/
if (cr.cr_error) {
ct->ct_error.re_errno = cr.cr_error;
ct->ct_error.re_status = RPC_CANTRECV;
goto out;
}
}
got_reply:
/*
* Now decode and validate the response. We need to drop the
* lock since xdr_replymsg may end up sleeping in malloc.
*/
mtx_unlock(&ct->ct_lock);
xdrmbuf_create(&xdrs, cr.cr_mrep, XDR_DECODE);
ok = xdr_replymsg(&xdrs, &reply_msg);
XDR_DESTROY(&xdrs);
cr.cr_mrep = NULL;
mtx_lock(&ct->ct_lock);
if (ok) {
if ((reply_msg.rm_reply.rp_stat == MSG_ACCEPTED) &&
(reply_msg.acpted_rply.ar_stat == SUCCESS))
ct->ct_error.re_status = RPC_SUCCESS;
else
_seterr_reply(&reply_msg, &(ct->ct_error));
if (ct->ct_error.re_status == RPC_SUCCESS) {
if (! AUTH_VALIDATE(cl->cl_auth,
&reply_msg.acpted_rply.ar_verf)) {
ct->ct_error.re_status = RPC_AUTHERROR;
ct->ct_error.re_why = AUTH_INVALIDRESP;
}
if (reply_msg.acpted_rply.ar_verf.oa_base != NULL) {
xdrs.x_op = XDR_FREE;
(void) xdr_opaque_auth(&xdrs,
&(reply_msg.acpted_rply.ar_verf));
}
} /* end successful completion */
/*
* If unsuccesful AND error is an authentication error
* then refresh credentials and try again, else break
*/
else if (ct->ct_error.re_status == RPC_AUTHERROR)
/* maybe our credentials need to be refreshed ... */
if (nrefreshes > 0 &&
AUTH_REFRESH(cl->cl_auth, &reply_msg)) {
nrefreshes--;
goto call_again;
}
/* end of unsuccessful completion */
} /* end of valid reply message */
else {
ct->ct_error.re_status = RPC_CANTDECODERES;
}
out:
mtx_assert(&ct->ct_lock, MA_OWNED);
if (mreq)
m_freem(mreq);
if (cr.cr_mrep)
m_freem(cr.cr_mrep);
mtx_unlock(&ct->ct_lock);
return (ct->ct_error.re_status);
}
static void
clnt_vc_geterr(CLIENT *cl, struct rpc_err *errp)
{
struct ct_data *ct = (struct ct_data *) cl->cl_private;
*errp = ct->ct_error;
}
static bool_t
clnt_vc_freeres(CLIENT *cl, xdrproc_t xdr_res, void *res_ptr)
{
XDR xdrs;
bool_t dummy;
xdrs.x_op = XDR_FREE;
dummy = (*xdr_res)(&xdrs, res_ptr);
return (dummy);
}
/*ARGSUSED*/
static void
clnt_vc_abort(CLIENT *cl)
{
}
static bool_t
clnt_vc_control(CLIENT *cl, u_int request, void *info)
{
struct ct_data *ct = (struct ct_data *)cl->cl_private;
void *infop = info;
mtx_lock(&ct->ct_lock);
switch (request) {
case CLSET_FD_CLOSE:
ct->ct_closeit = TRUE;
mtx_unlock(&ct->ct_lock);
return (TRUE);
case CLSET_FD_NCLOSE:
ct->ct_closeit = FALSE;
mtx_unlock(&ct->ct_lock);
return (TRUE);
default:
break;
}
/* for other requests which use info */
if (info == NULL) {
mtx_unlock(&ct->ct_lock);
return (FALSE);
}
switch (request) {
case CLSET_TIMEOUT:
if (time_not_ok((struct timeval *)info)) {
mtx_unlock(&ct->ct_lock);
return (FALSE);
}
ct->ct_wait = *(struct timeval *)infop;
break;
case CLGET_TIMEOUT:
*(struct timeval *)infop = ct->ct_wait;
break;
case CLGET_SERVER_ADDR:
(void) memcpy(info, &ct->ct_addr, (size_t)ct->ct_addr.ss_len);
break;
case CLGET_SVC_ADDR:
/*
* Slightly different semantics to userland - we use
* sockaddr instead of netbuf.
*/
memcpy(info, &ct->ct_addr, ct->ct_addr.ss_len);
break;
case CLSET_SVC_ADDR: /* set to new address */
mtx_unlock(&ct->ct_lock);
return (FALSE);
case CLGET_XID:
*(uint32_t *)info = ct->ct_xid;
break;
case CLSET_XID:
/* This will set the xid of the NEXT call */
/* decrement by 1 as clnt_vc_call() increments once */
ct->ct_xid = *(uint32_t *)info - 1;
break;
case CLGET_VERS:
/*
* This RELIES on the information that, in the call body,
* the version number field is the fifth field from the
* begining of the RPC header. MUST be changed if the
* call_struct is changed
*/
*(uint32_t *)info =
ntohl(*(uint32_t *)(void *)(ct->ct_mcallc +
4 * BYTES_PER_XDR_UNIT));
break;
case CLSET_VERS:
*(uint32_t *)(void *)(ct->ct_mcallc +
4 * BYTES_PER_XDR_UNIT) =
htonl(*(uint32_t *)info);
break;
case CLGET_PROG:
/*
* This RELIES on the information that, in the call body,
* the program number field is the fourth field from the
* begining of the RPC header. MUST be changed if the
* call_struct is changed
*/
*(uint32_t *)info =
ntohl(*(uint32_t *)(void *)(ct->ct_mcallc +
3 * BYTES_PER_XDR_UNIT));
break;
case CLSET_PROG:
*(uint32_t *)(void *)(ct->ct_mcallc +
3 * BYTES_PER_XDR_UNIT) =
htonl(*(uint32_t *)info);
break;
case CLSET_WAITCHAN:
ct->ct_waitchan = *(const char **)info;
break;
case CLGET_WAITCHAN:
*(const char **) info = ct->ct_waitchan;
break;
case CLSET_INTERRUPTIBLE:
if (*(int *) info)
ct->ct_waitflag = PCATCH;
else
ct->ct_waitflag = 0;
break;
case CLGET_INTERRUPTIBLE:
if (ct->ct_waitflag)
*(int *) info = TRUE;
else
*(int *) info = FALSE;
break;
default:
mtx_unlock(&ct->ct_lock);
return (FALSE);
}
mtx_unlock(&ct->ct_lock);
return (TRUE);
}
static void
clnt_vc_destroy(CLIENT *cl)
{
struct ct_data *ct = (struct ct_data *) cl->cl_private;
struct socket *so = NULL;
mtx_lock(&ct->ct_lock);
if (ct->ct_socket) {
SOCKBUF_LOCK(&ct->ct_socket->so_rcv);
ct->ct_socket->so_upcallarg = NULL;
ct->ct_socket->so_upcall = NULL;
ct->ct_socket->so_rcv.sb_flags &= ~SB_UPCALL;
SOCKBUF_UNLOCK(&ct->ct_socket->so_rcv);
KASSERT(!TAILQ_FIRST(&ct->ct_pending),
("Destroying RPC client with pending RPC requests"));
if (ct->ct_closeit) {
so = ct->ct_socket;
}
}
mtx_unlock(&ct->ct_lock);
mtx_destroy(&ct->ct_lock);
if (so) {
soshutdown(so, SHUT_WR);
soclose(so);
}
mem_free(ct, sizeof(struct ct_data));
mem_free(cl, sizeof(CLIENT));
}
/*
* Make sure that the time is not garbage. -1 value is disallowed.
* Note this is different from time_not_ok in clnt_dg.c
*/
static bool_t
time_not_ok(struct timeval *t)
{
return (t->tv_sec <= -1 || t->tv_sec > 100000000 ||
t->tv_usec <= -1 || t->tv_usec > 1000000);
}
void
clnt_vc_soupcall(struct socket *so, void *arg, int waitflag)
{
struct ct_data *ct = (struct ct_data *) arg;
struct uio uio;
struct mbuf *m;
struct ct_request *cr;
int error, rcvflag, foundreq;
uint32_t xid, header;
uio.uio_td = curthread;
do {
/*
* If ct_record_resid is zero, we are waiting for a
* record mark.
*/
if (ct->ct_record_resid == 0) {
bool_t do_read;
/*
* Make sure there is either a whole record
* mark in the buffer or there is some other
* error condition
*/
do_read = FALSE;
SOCKBUF_LOCK(&so->so_rcv);
if (so->so_rcv.sb_cc >= sizeof(uint32_t)
|| (so->so_rcv.sb_state & SBS_CANTRCVMORE)
|| so->so_error)
do_read = TRUE;
SOCKBUF_UNLOCK(&so->so_rcv);
if (!do_read)
return;
uio.uio_resid = sizeof(uint32_t);
m = NULL;
rcvflag = MSG_DONTWAIT | MSG_SOCALLBCK;
error = soreceive(so, NULL, &uio, &m, NULL, &rcvflag);
if (error == EWOULDBLOCK)
break;
/*
* If there was an error, wake up all pending
* requests.
*/
if (error || uio.uio_resid > 0) {
wakeup_all:
mtx_lock(&ct->ct_lock);
if (!error) {
/*
* We must have got EOF trying
* to read from the stream.
*/
error = ECONNRESET;
}
ct->ct_error.re_status = RPC_CANTRECV;
ct->ct_error.re_errno = error;
TAILQ_FOREACH(cr, &ct->ct_pending, cr_link) {
cr->cr_error = error;
wakeup(cr);
}
TAILQ_INIT(&ct->ct_pending);
mtx_unlock(&ct->ct_lock);
break;
}
memcpy(&header, mtod(m, uint32_t *), sizeof(uint32_t));
header = ntohl(header);
ct->ct_record = NULL;
ct->ct_record_resid = header & 0x7fffffff;
ct->ct_record_eor = ((header & 0x80000000) != 0);
m_freem(m);
} else {
/*
* We have the record mark. Read as much as
* the socket has buffered up to the end of
* this record.
*/
uio.uio_resid = ct->ct_record_resid;
m = NULL;
rcvflag = MSG_DONTWAIT | MSG_SOCALLBCK;
error = soreceive(so, NULL, &uio, &m, NULL, &rcvflag);
if (error == EWOULDBLOCK)
break;
if (error || uio.uio_resid == ct->ct_record_resid)
goto wakeup_all;
/*
* If we have part of the record already,
* chain this bit onto the end.
*/
if (ct->ct_record)
m_last(ct->ct_record)->m_next = m;
else
ct->ct_record = m;
ct->ct_record_resid = uio.uio_resid;
/*
* If we have the entire record, see if we can
* match it to a request.
*/
if (ct->ct_record_resid == 0
&& ct->ct_record_eor) {
/*
* The XID is in the first uint32_t of
* the reply.
*/
ct->ct_record =
m_pullup(ct->ct_record, sizeof(xid));
if (!ct->ct_record)
break;
memcpy(&xid,
mtod(ct->ct_record, uint32_t *),
sizeof(uint32_t));
xid = ntohl(xid);
mtx_lock(&ct->ct_lock);
foundreq = 0;
TAILQ_FOREACH(cr, &ct->ct_pending, cr_link) {
if (cr->cr_xid == xid) {
/*
* This one
* matches. We snip it
* out of the pending
* list and leave the
* reply mbuf in
* cr->cr_mrep. Set
* the XID to zero so
* that clnt_vc_call
* can know not to
* repeat the
* TAILQ_REMOVE.
*/
TAILQ_REMOVE(&ct->ct_pending,
cr, cr_link);
cr->cr_xid = 0;
cr->cr_mrep = ct->ct_record;
cr->cr_error = 0;
foundreq = 1;
wakeup(cr);
break;
}
}
mtx_unlock(&ct->ct_lock);
if (!foundreq)
m_freem(ct->ct_record);
ct->ct_record = NULL;
}
}
} while (m);
}
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